Benchmarks: Storage
Getting access to M.2 requires removing the 3D-printed appendage. What you do get, from a capable drive, is some blistering speed. The Samsung 950 Pro 256GB NVMe is a speedy little bugger.
SATA and USB 3.1 performance use the same drive: an SK hynix Canvas SC300 512GB, although in the latter case it is installed inside a StarTech caddy featuring the newer standard.